TW201420054A - Hygroscopic non-woven fabric and fabricating method thereof - Google Patents

Abstract

The present invention provides a hygroscopic non-woven fabric, comprising a plurality of filament fibers having lengths ranging from 10 mm to 76 mm, a plurality of composite staple fibers with thermofusible adhesion having lengths ranging from 1 mm to 10 mm, and a plurality of cellulose fibers, wherein the fibers are physically tangled with each other. Compared to the conventional hygroscopic non-woven fabric made by filament fibers only, the present invention that uses composite staple fibers with thermofusible adhesion and cellulose fibers is capable of reducing material cost of the conventional hygroscopic non-woven fabric and enhancing mechanical properties (such as tensile strength and elongation rate) and absorption rate.

Description

Non-woven fabric for moisture absorption and its preparation method

The present invention relates to a non-woven fabric for moisture absorption, and more particularly to a non-woven fabric for moisture absorption comprising long fibers, short fibers and cellulose fibers.

Paper towels are essential for daily use to wipe and remove stains attached to the surface of objects. Generally, paper towels can be roughly divided into dry paper towels and wet paper towels. However, whether it is a dry paper towel or a wet tissue, it is required to satisfy the characteristics of softness, tensile strength, absorption rate, and smoothness and smoothness of the surface.

In the past, most of the paper towels were formed by a water-jet method, wherein the fiber web was formed by carding a plurality of long fibers having an average length ranging from 10 mm to 76 mm. And the long fiber is a chemical fiber. However, the paper towel is completely prepared by using chemical fiber, and the high cost of the chemical fiber leads to high cost of the raw material of the paper towel, which is not cost-effective.

The TW182129 patent publication discloses a high toughness wipe. The high-toughness wiper comprises two wiping layers and a moisture absorbing layer interposed between the wiping layers, wherein the wiping layer and the moisture absorbing layer are bonded by a hot rolling method. The wiping layers are respectively formed of kapok tree fibers having a fiber length ranging from 1.25 mm to 5 mm, and the moisture absorbing layer is obtained by mixing 50% by weight of rayon rayon cotton with 50% by weight of polypropylene fibers. Formed by hot air method. However, the rayon rayon cotton used in the moisture absorbing layer is expensive, and the high-toughness viscous wipes produced by the hot air method are flat and hard.

In view of the above, providing a paper towel which is more soft and low in cost is a subject that can be further broken by those skilled in the art.

Accordingly, a first object of the present invention is to provide a moisture-absorbing nonwoven fabric which is low in cost, excellent in mechanical properties (e.g., tensile strength and elongation), and excellent in absorption rate.

Thus, the absorbent nonwoven fabric of the present invention comprises: a plurality of long fibers having a length ranging from 10 mm to 76 mm; a plurality of composite short fibers having a heat-adhesive strength ranging from 1 mm to 10 mm; and a plurality of cellulose fibers, wherein The fibers are substantially entangled with each other.

A second object of the present invention is to provide a method for producing a nonwoven fabric for moisture absorption.

Therefore, the method for preparing the absorbent nonwoven fabric of the present invention comprises the steps of: (a) providing a mixed fiber comprising a plurality of composite short fibers and a plurality of cellulose fibers having a heat-adhesive strength ranging from 1 mm to 10 mm; (b) subjecting the mixed fiber to air-laid treatment and heat treatment to form a mixed fiber cloth; (c) providing two long fiber webs comprising a plurality of long fibers ranging in length from 10 mm to 76 mm a mixture formed by a carding process; (d) arranging the mixed fibers between the lengthous fiber webs and performing hydroentanglement After treatment, a non-woven fabric for moisture absorption can be obtained.

The effect of the present invention is that the present invention can reduce the conventional suction by using a composite short fiber having a hot melt adhesive property and a cellulose fiber instead of a part of the long fiber. The raw material cost of wet non-woven fabrics, and can improve its mechanical properties (such as tensile strength and elongation) and absorption rate. Moreover, the method of the present invention can produce a moisture-absorbing non-woven fabric by combining air-laid treatment, heat treatment, carding treatment and hydroentangling treatment in one production line.

The non-woven fabric for moisture absorption of the present invention comprises: a plurality of filament fibers having a length ranging from 10 mm to 76 mm; a plurality of staple fibers having a heat-adhesive property ranging from 1 mm to 10 mm; and plural a cellulose fiber in which the fibers are substantially entangled with each other.

The moisture absorbing nonwoven fabric has a basis weight ranging from 20 g/m ² to 120 g/m ² . The moisture absorbing nonwoven fabric has a thickness ranging from 0.1 mm to 5 mm.

The absorbent nonwoven fabric of the present invention can be used as or applied to a paper towel, a mask or a pad.

The respective components in the absorbent nonwoven fabric of the present invention will be further described below:

[long fiber]

The isometric fibers are selected from natural fibers, chemical fibers, or a combination thereof. The natural fiber is selected from plant fibers, animal fibers, or the like A combination. The plant fiber may be used singly or in combination, and the plant fiber is, for example but not limited to, seed fiber (such as cotton), bast fiber (such as linen or hemp), vein fiber (such as Manila hemp), or fruit fiber (such as coconut). )Wait. The animal fibers may be used singly or in combination, and the animal fibers are, for example but not limited to, animal skin fibers or silk fibers. The chemical fiber is selected from the group consisting of recycled fiber, semi-synthetic fiber, synthetic fiber, or a combination thereof. The regenerated fibers may be used singly or in combination, and the regenerated fibers are, for example but not limited to, rayon or the like. The semisynthetic fibers may be used singly or in combination, and the semisynthetic fibers are, for example but not limited to, cellulose acetate or the like. The synthetic fiber may be used singly or in combination, and the synthetic fiber is, for example, but not limited to, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET). , or polyamide, and the like. Preferably, the material of the isometric fibers comprises at least one material consisting of the following groups: polyethylene, polypropylene, polyethylene terephthalate, bismuth, in consideration of the cost of the moisture absorbing nonwoven fabric. And cotton fiber.

Preferably, the total amount of the isometric fibers is in the range of 10% by weight to 80% by weight based on 100% by weight of the total of the moisture-absorbing nonwoven fabric. The filaments have a fineness ranging from 1 Danny to 6 Danny.

[Composite staple fiber with hot melt adhesion]

The composite short fiber with hot-melt adhesive has the ability of hot-melt adhesion, and the cellulose fibers adjacent to each other can be connected together to prevent the cellulose fibers from being lost after hydroentangling treatment, thereby causing moisture absorption. The problem of poor moisture absorption rate of non-woven fabrics, as well as the difficulty of subsequent wastewater treatment, And increase the cost of wastewater treatment.

The composite short fiber having hot melt adhesive property is selected from polyethylene-polypropylene fiber, polyethylene-polyethylene terephthalate fiber, low temperature polylactic acid-high temperature polylactic acid fiber, and modified by maleic anhydride. Polyethylene-polypropylene fibers, and polyethylene-polyethylene terephthalate fibers modified with maleic anhydride. In a specific embodiment of the invention, the hot-melt adhesive composite staple fibers are polyethylene-polypropylene fibers.

Preferably, the total amount of the heat-fusible composite short fibers is from 1% by weight to 20% by weight based on 100% by weight of the total of the moisture-absorbing nonwoven fabric. The fineness of the hot-melt adhesive composite staple fibers ranges from 1 Danny to 6 Danny.

[Cellulose fiber]

Preferably, the total amount of the cellulose fibers used is in the range of 5 wt% to 60 wt%, based on 100 wt% of the total amount of the absorbent nonwoven fabric. The cellulosic fibers have a fineness ranging from 0.1 denier to 10 denier. Preferably, the cellulose fibers have an average length ranging from 1 mm to 5 mm.

The cellulose fiber can be produced in a conventional manner, for example, from pulp or wood pulp.

[Preparation of non-woven fabric for moisture absorption]

The preparation method of the non-woven fabric for moisture absorption according to the present invention comprises the following steps: (a) providing a mixed fiber comprising a plurality of composite short fibers and a plurality of cellulose fibers having a heat-adhesive strength ranging from 1 mm to 10 mm; Air-laid treatment and heat treatment of the mixed fiber Forming a mixed fiber cloth; (c) providing two long fiber webs formed by a carding process comprising a mixture of a plurality of long fibers having a length ranging from 10 mm to 76 mm; (d) The mixed fiber is disposed between the equal length fiber webs and subjected to water-jet treatment to obtain a moisture-absorbing nonwoven fabric.

The composite short fibers, cellulose fibers, and long fibers having hot-melt adhesive properties are as described above, and thus are not described herein. Preferably, the total amount of the long fibers used is in the range of 10% by weight to 80% by weight based on 100% by weight of the total of the moisture-absorbing nonwoven fabric. Preferably, the cellulose fibers are used in an amount ranging from 5 wt% to 60 wt%, based on 100% by weight of the total of the moisture-absorbing nonwoven fabric.

The airlaid process refers to the use of a gas stream (e.g., air) to uniformly disperse the mixed fibers in a gas and adsorb onto the screen to form a mixed web. The airlaid treatment can be carried out using a conventional airlaid device. The airlaid airflow ranges from 100 CMM to 1,000 CMM.

The heat treatment means that the mixed fibers are joined to each other to achieve a fixed effect. This heat treatment can be carried out by using a conventional heating device. The heat treatment has an operating temperature ranging from 50 ° C to 180 ° C. The mixed fiber cloth has a basis weight ranging from 5 g/m ² to 100 g/m ² . The mixed fiber cloth has a thickness ranging from 0.1 mm to 10 mm.

The carding process refers to the process of forming a plurality of long fibers into a long fiber web. This carding process can be carried out using a conventional carding device. The long fiber web has a basis weight ranging from 5 g/m ² to 100 g/m ² . The long fiber web has a thickness ranging from 0.1 mm to 10 mm.

The spunlace treatment refers to a process in which a high-pressure water stream is directed perpendicularly to the long fiber web so that the water flow can entangle the long fibers and the mixed fiber cloth in the same-length fiber web. This spunlace treatment can be carried out using a conventional hydroentanglement apparatus.

The invention is further described in the following examples, but it should be understood that these examples are for illustrative purposes only and are not to be construed as limiting.

<Example> <Example 1>

A polyethylene-polypropylene staple fiber comprising 10% by weight of a plurality of strips having an average length of 6 mm is mixed with 50% by weight of pulp to form a mixed fiber, and then the mixed fiber is subjected to air-laid treatment (air flow rate is 130 CMM,) And heat treatment (temperature 135 ° C) to form a mixed fiber cloth.

20% by weight of solid polyethylene terephthalate long fibers, and 20% by weight of a plurality of 4T polyethylene terephthalate long fibers having an average length of 38 mm were subjected to carding treatment to form a long fiber web.

The mixed fiber was placed between two long fiber webs and subjected to hydroentangling (water pressure of 50 bar) to obtain a moisture-absorbing non-woven fabric.

<Examples 2 to 6 and Comparative Example 1>

In Examples 2 to 6 and Comparative Example 1, the nonwoven fabric for moisture absorbing fabric was produced in the same manner as in Example 1, except that the long fiber material, the long fiber amount, and the composite short fiber material having hot melt adhesiveness were changed. The amount of composite short fibers with hot melt adhesion and the amount of cellulose fiber used ,As shown in Table 1.

【Test items】

1. Basis weight (g/m ² ):

According to the American Society for Testing and Materials (ASTM) No. D3776-85 test standard at a temperature of 23 ± 0.5 ° C, relative humidity of 65 ± 2%, under normal atmospheric pressure, in the electronic days to measure the quality of the test piece And calculate the mass per unit area of the test piece.

2. Tensile strength (Kgf/25mm):

The moisture-absorbing nonwoven fabrics of Examples 1 to 6 and Comparative Example 1 were cut into test pieces having a length of 150 mm and a width of 25.4 mm, and tested in accordance with ASTM D-1117, and the unit was Kgf/25 mm.

3. Elongation (%):

The moisture-absorbing nonwoven fabrics of Examples 1 to 6 and Comparative Example 1 were cut into test pieces having a length of 150 mm and a width of 25.4 mm, and tested in accordance with ASTM D-1117, and the unit was %.

4. Moisture content (%):

The absorbent nonwoven fabrics of Examples 1 to 6 and Comparative Example 1 were weighed (W1), and then placed in a hot air circulating oven, dried at 105 ± 2 ° C for about two hours, taken out and placed in a dryer. After cooling for 20 to 30 minutes, the weight is further weighed (W2), and the water content is calculated as follows: moisture content (%) = [(W1 - W2) / W1] × 100%.

5. Absorption rate (%):

According to ISO 9073.6: 2000 textile-non-woven test method. Will seven The hot air non-woven bags of 26gsm×30cm×20cm are weighed separately (W1), and the hot air non-woven bags are sealed and sealed in pure water for 5 minutes, then removed and placed in 10 mesh. On the barbed wire, it is naturally dripped for 1 minute, after which it is weighed separately (W2).

The moisture-absorbing non-woven fabrics of Examples 1 to 6 and Comparative Example 1 were weighed (W3) and placed in the hot air non-woven fabric bags, and the hot air non-woven fabric bags were sealed and sealed in pure water, respectively. Minutes, then, after being taken out, placed on a wire mesh of 10 mesh, naturally dripped for 1 minute, and then weighed separately (W4), and the absorption rate was calculated as follows: absorption rate (%) = {[W4-W3-( W2-W1)]/W3}×100%.

6. Stiffness:

The moisture-absorbing nonwoven fabrics of Examples 1 to 6 and Comparative Example 1 were respectively cut into test pieces having a width of 25 mm and a length of 250 mm, and placed at 23 ° C and a relative humidity of 50% for 24 hours, respectively, and then according to ISO 9073.7. : 1995 Non-woven tensile strength test method, ASTM D-1117 regulations and testing using a softness tester, the unit is mN-cm.

The test method is that the test pieces are slowly moved forward until the test pieces sag parallel to the 45° slope, and the distance (cm) for moving forward is recorded, and the front and back sides of the longitudinal and lateral directions are respectively tested six times, and Average it to obtain an average value (C, unit cm), and then calculate the rigidity by the following formula: Rigidity (mN-cm) = basis weight (g/m ² ) × C × 10 ^-3 (gravity acceleration is 10 /s ² )

It can be seen from the experimental results of Table 1 that the present invention has hot melt adhesiveness. The composite short fibers and the cellulose fibers are substituted for a part of the long fibers, and the absorbent non-woven fabric of the present invention has better tensile strength, elongation and absorption rate than the long fibers which are completely used in Comparative Example 1.

In summary, the present invention can reduce the conventional moisture absorption by using a composite short fiber having a hot melt adhesive property and a cellulose fiber instead of a part of the long fiber. Use non-woven raw material costs and improve its mechanical properties (such as tensile strength and elongation) and absorption rate. Moreover, the method of the present invention can produce a moisture-absorbing non-woven fabric by combining air-laid treatment, heat treatment, carding treatment and hydroentanglement treatment in one production line, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

Claims (9)

A non-woven fabric for moisture absorption, comprising: a plurality of long fibers having a length ranging from 10 mm to 76 mm; a plurality of composite short fibers having a heat-adhesive strength ranging from 1 mm to 10 mm; and a plurality of cellulose fibers, wherein The fibers are physically entangled with each other. The non-woven fabric for moisture absorption according to claim 1, wherein the material of the isometric fibers respectively comprises at least one of the following groups: polyethylene, polypropylene, polyethylene terephthalate, hydrazine, And cotton fiber. The non-woven fabric for moisture absorption according to claim 1, wherein the composite short fiber having hot-melt adhesive property is selected from the group consisting of polyethylene-polypropylene fibers, polyethylene-polyethylene terephthalate fibers, and low-temperature polymerization. Lactic acid-high temperature polylactic acid fiber, polyethylene-polypropylene fiber modified with maleic anhydride, polyethylene-polyethylene terephthalate fiber modified with maleic anhydride, or a combination thereof. The moisture-absorbing nonwoven fabric according to claim 1, wherein the total amount of the cellulose fibers used is in the range of 5 wt% to 60 wt%, based on 100 wt% of the total amount of the moisture-absorbing nonwoven fabric. The non-woven fabric for moisture absorption according to claim 1, wherein the total amount of the composite short fibers having hot-melt adhesiveness is from 1% by weight to 20% by weight based on 100% by weight of the total of the moisture-absorbing nonwoven fabric. . The absorbent nonwoven fabric of claim 1, wherein the cellulose fibers have a length ranging from 1 mm to 5 mm. A method for preparing a non-woven fabric for moisture absorption, comprising the steps of: (a) providing a mixed fiber comprising a plurality of composite short fibers and a plurality of cellulose fibers having a heat-adhesive strength ranging from 1 mm to 10 mm; (b) The mixed fiber is subjected to air-laid treatment and heat treatment to form a mixed fiber cloth; (c) two long fiber webs are provided, which are passed through a mixture comprising a plurality of long fibers having a length ranging from 10 mm to 76 mm. The carding process is formed; (d) the mixed fiber is disposed between the equal length fiber webs and subjected to hydroentangling treatment to obtain a moisture-absorbing non-woven fabric. The method for producing a moisture-absorbing nonwoven fabric according to claim 7, wherein the total amount of the cellulose fibers used is in the range of 5 wt% to 60 wt% based on 100 wt% of the total amount of the moisture-absorbing nonwoven fabric. The method for producing a moisture-absorbing nonwoven fabric according to claim 7, wherein the total amount of the long fibers used is in the range of 10% by weight to 80% by weight based on 100% by weight of the total of the moisture-absorbing nonwoven fabric.